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Internalization of Methotrexate Conjugates by Folate Receptor-α

Eugénia Nogueira1, Marisa P Sárria1,2, Nuno G Azoia1

  • 1Centre of Biological Engineering , University of Minho , Campus of Gualtar , 4710-057 Braga , Portugal.

Biochemistry
|November 20, 2018
PubMed

Insights

Methotrexate enters cells via folate transporters. This study reveals methotrexate

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Methotrexate (MTX) is a vital antifolate chemotherapy agent.
  • MTX cellular uptake occurs via the reduced folate carrier (RFC) and folate receptors (FRs).
  • The precise mechanism of FR-mediated MTX uptake remains largely unelucidated.

Purpose of the Study:

  • To elucidate the mechanism of MTX uptake mediated by folate receptor-alpha (FRα).
  • To investigate the role of MTX's chemical structure in FRα interaction.

Main Methods:

  • Utilized two fluorescently labeled methotrexate conjugates with distinct terminal group linkages.
  • Analyzed the uptake mechanism of these conjugates via folate receptor-alpha.

Main Results:

  • Demonstrated that specific amino groups of methotrexate are crucial for FRα interaction.
  • Provided mechanistic insights into how FRα recognizes and transports methotrexate.

Conclusions:

  • Methotrexate's amino groups play a critical role in its interaction with folate receptor-alpha.
  • Findings facilitate the development of targeted antifolate therapies by clarifying FRα-mediated transport.

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